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[jira] [Created] (GEODE-3622) The first HeapLRU evictions on large region can consume high amounts of CPU

Date

Thu, 14 Sep 2017 23:05:00 GMT

Darrel Schneider created GEODE-3622:
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Summary: The first HeapLRU evictions on large region can consume high amounts
of CPU
Key: GEODE-3622
URL: https://issues.apache.org/jira/browse/GEODE-3622
Project: Geode
Issue Type: Bug
Components: eviction
Reporter: Darrel Schneider
If you have a region configured for HeapLRU eviction and are able to put a large number of
entries in it before hitting the eviction threshold, then the first evictions will consume
much more CPU than subsequent evictions. The reason for this is that the eviction list is
not initialized until the first eviction is done. At that time a scan is done of all the existing
entries marking each one as not having been recently used. This can touch a large number of
memory pages and also hits some common synchronization locks. You can see that this is happening
by looking at the HeapLRUStats.lruEvaluations stat.
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